
\begin{tikzpicture}[scale=5]
  \tkzDefPoints{-1/0/A,0/0/B}
  \tkzDefPoint(100:1){C}
  \tkzDefPointBy[rotation=center A angle 30](C) \tkzGetPoint{a}
  \tkzDefPointBy[rotation=center B angle 20](C) \tkzGetPoint{b}
  \tkzInterLL(A,a)(B,b)                         \tkzGetPoint{D}
  \tkzDrawPolygon(A,B,C,D)
  \tkzDrawSegments(A,C B,D)
  \tkzDrawPoints(A,B,C,D)
  \tkzLabelPoints[below](A,B)
  \tkzLabelPoints[above](C,D)
\end{tikzpicture}
